exercise/src/main/java/com/code/stream/chapter07/ProcessFunctionTest.java
<filename>exercise/src/main/java/com/code/stream/chapter07/ProcessFunctionTest.javapackage com.code.stream.chapter07;

import com.code.stream.chapter05.ClickSource;
import com.code.stream.entity.Event;
import org.apache.flink.api.common.eventtime.SerializableTimestampAssigner;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.functions.AggregateFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.ProcessFunction;
import org.apache.flink.streaming.api.windowing.assigners.TumblingEventTimeWindows;
import org.apache.flink.streaming.api.windowing.time.Time;
import org.apache.flink.util.Collector;

import java.sql.Timestamp;
import java.time.Duration;

/**
 * @author oker
 */
public class ProcessFunctionTest {
    public static void main(String[] args) throws Exception {
        // 获取 Flink 流处理执行环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);
        // 设置水位线生成时间间隔
        env.getConfig().setAutoWatermarkInterval(100);

        SingleOutputStreamOperator<Event> streamSource = env.addSource(new ClickSource())
                //  乱序流的 waterMark 生成：0秒延迟
                .assignTimestampsAndWatermarks(WatermarkStrategy.<Event>forBoundedOutOfOrderness(Duration.ZERO)
                        .withTimestampAssigner(new SerializableTimestampAssigner<Event>() {
                            @Override
                            public long extractTimestamp(Event element, long recordTimestamp) {
                                return element.getTimestamp();
                            }
                        }));
        streamSource.process(new ProcessFunction<Event, String>() {
            @Override
            public void processElement(Event event, ProcessFunction<Event, String>.Context context, Collector<String> collector) throws Exception {
                // 具体逻辑
            }
        });

        env.execute();
    }
}
